CN102163882B - Method and device for transporting fluid through pipeline by using motor - Google Patents

Abstract

A stator (122) for an electrical machine includes teeth (206) assembled from a plurality of stacked laminations (232, 234) mounted on a cylindrical protective surface thereby forming a plurality of slots (208). The stator also includes an armature winding (242, 244) assembled within the teeth by inserting components of the armature winding into the plurality of stator slots from positions external to the teeth in a manner that facilitates mitigating potential for coil distortion. The armature winding includes a plurality of coils that each include an end winding. The stator further includes a segmented yoke (204) inserted around the armature winding in a manner that facilitates mitigating a potential for disturbing the end winding of the coils. Independently assembling the stator components in this manner facilitates varying a thickness and/or the number of heat conducting laminations between the yoke and teeth that subsequently facilitates heat transfer from the armature winding to an outer pressure casing of the machine.

Description

Method and device for transporting fluid through pipeline by using motor

This case is a divisional application of the patent application No. 200710106486.7 with the same title filed on June 1, 2007.

technical field

The present invention relates generally to fluid transfer systems, and more particularly to methods and apparatus for transferring fluid through tubing using electric motors.

Background technique

Fluid transfer is used in many different industries including, but not limited to, the chemical, oil and gas industries. In one known fluid transfer application, fluid is transferred from an onshore or offshore location to a processing plant for subsequent use. Among other known applications, fluid transport is used in the hydrocarbon processing and chemical industries and facilitates distribution to end users.

At least some known fluid transfer stations employ fluid transfer devices such as compressors, fans, and/or pumps driven by gas turbines. Some of these gas turbines drive an associated fluid delivery device through a gearbox that increases or decreases the gas turbine output drive shaft speed to the drive shaft speed of the intended device. Electric motors (i.e. electrically driven electric motors or electronic drives) have advantages over mechanical drives (i.e. gas turbines) in terms of operational flexibility (e.g. variable speed), maintainability, lower capital and operating costs, more It has advantages in terms of high efficiency and environmental compatibility. Additionally, electronic drives are typically simpler in construction than mechanical drives, typically require a smaller footprint, can be more easily integrated with fluid delivery devices, can eliminate the need for gearboxes, and/or can be more compact than mechanical drives. more reliable.

However, systems employing electronic drives may have lower efficiencies than those employing mechanical drives. At least some of the factors that affect the efficiency of an electronic drive include the electrical and electronic layout of the motor drive and drive controls, the quality and efficiency of the power supply, the size and weight of the electronic drive components (eg, the stator), and the strength of the magnetic coupling. Furthermore, the electronic drive of the fluid delivery device generates heat through the drive components, eg in the stator, and requires an auxiliary system to dissipate the heat. For example, some known electric drives employ transported fluid as the primary heat transfer medium and direct the fluid through and around the stator. However, in some cases, the delivered fluid can have intrusive constituents or impurities that can adversely affect the efficiency of the employed components.

Contents of the invention

In one aspect, a stator assembly for an electric machine is provided. The stator assembly includes a pressure vessel defining at least one enclosure therein. The stator assembly also includes a yoke within the pressure vessel that includes a plurality of elements. Each of the elements includes at least one mating surface and the elements are removably connected together along the mating surface. The stator assembly also includes a plurality of teeth defining a plurality of slots within the yoke such that slots are defined between adjacent teeth.

In another aspect, a stator assembly for an electric machine is provided. The stator assembly includes a pressure vessel and a yoke in thermal communication with the pressure vessel to facilitate removal of heat from the stator assembly. The stator assembly also includes a plurality of teeth having a plurality of laminations. The plurality of laminations includes at least one first lamination having a first thermal conductivity and a first magnetic permeability and at least one second lamination having a second thermal conductivity and a second magnetic permeability. The first thermal conductivity is different from the second thermal conductivity and the first magnetic permeability is different from the second magnetic permeability. The second lamination includes a first portion extending radially within the plurality of teeth with a first predetermined axial thickness and a second portion extending radially within the yoke with a second predetermined axial thickness. The second portion is in thermal communication with the pressure vessel to facilitate removal of heat from the stator assembly.

In another aspect, a fluid transfer station is provided. The fluid transfer station includes a fluid transfer assembly. The fluid delivery assembly includes at least one rotational shaft. The station also includes a drive motor having a rotor assembly and a stator assembly including a pressure vessel, a yoke, and a plurality of teeth. The pressure vessel includes at least one enclosure defined therein, and the yoke includes a plurality of elements. Each element includes at least one mating surface and the elements are removably connected together along the mating surface. The yoke is inside a pressure vessel. The plurality of teeth define a plurality of slots such that slots are defined between adjacent teeth. The plurality of teeth are within the yoke. The rotor is magnetically connected to the stator assembly. The rotor assembly of the drive motor is rotatably coupled to at least one rotational shaft of the fluid delivery assembly.

Description of drawings

Figure 1 is a schematic cross-sectional view of an exemplary fluid transfer station;

Figure 2 is a schematic cross-sectional view of an exemplary motor that may be used in the fluid transfer station shown in Figure 1;

Figure 3 is a skewed axial view of a portion of an exemplary stator package that may be used with the motor shown in Figure 2;

Fig. 4 is a skewed axial schematic view of an exemplary tooth portion of the exemplary stator assembly that may be used in the electric motor shown in Fig. 2;

Figure 5 is an axial schematic view of a portion of an alternative package tooth section that may be used with the motor shown in Figure 2;

Figure 6 is an axial schematic view of a portion of an alternative package tooth section that may be used with the motor shown in Figure 2;

Figure 7 is an axial schematic view of a portion of an alternative package tooth section that may be used with the motor shown in Figure 2;

Figure 8 is an axial schematic view of a portion of an alternative package tooth section that may be used with the motor shown in Figure 2;

Figure 9 is a skewed axial view of an illustrative yoke that may be used with the illustrative stator assembly of the electric motor shown in Figure 2;

10 is a schematic cross-sectional view of a plurality of thermally conductive laminations that may be used in the exemplary stator assembly of the electric motor shown in FIG. 2;

11 is a schematic cross-sectional view of an alternative stator that may be used in the motor shown in FIG. 2, the stator having a plurality of thermally conductive laminations thicker in the yoke than in the teeth;

12 is a schematic cross-sectional view of an alternative stator that may be used in the motor shown in FIG. 2, the stator having a plurality of thermally conductive laminations thicker in the teeth than in the yoke;

13 is a schematic cross-sectional view of a number of alternative thermally conductive stator laminations with varying axial pitches that may be used in the motor shown in FIG. 2;

14 is a schematic cross-sectional view of a plurality of exemplary armature windings that may be used in the motor shown in FIG. 2;

Fig. 15 is a skewed axial schematic view of the stator teeth connected to the central part of the stator package that can be used on the motor shown in Fig. 2;

Fig. 16 is a schematic cross-sectional axial view of a plurality of exemplary armature windings that may be used in the motor shown in Fig. 2;

Fig. 17 is a schematic cross-sectional axial view of a plurality of yokes connected to a plurality of armature windings to form an exemplary stator core that may be used in the motor shown in Fig. 2;

Figure 18 is a skewed axial view of an exemplary pressure vessel that may be used with the motor shown in Figure 2; and

FIG. 19 is an axial schematic view of an exemplary pressure vessel that may be used with the electric motor shown in FIG. 2 .

Detailed ways

FIG. 1 is a schematic cross-sectional view of an exemplary fluid transfer station 100 . In the exemplary embodiment, station 100 is a submerged natural gas compression station 100 that includes fluid delivery assembly 102 . In the illustrated embodiment, assembly 102 is a multi-stage compressor 102 rotatably coupled to an electrically driven motor 104 . Alternatively, component 102 may be, but is not limited to, a pump or a fan. Station 100 may be located at any geographic location and may facilitate delivery of any fluid in which predetermined operating parameters are obtained. An example of, but not limited to, a fluid that may be conveyed by station 100 is untreated methane directed to station 100 from a natural source (not shown in FIG. 1 ).

In the exemplary embodiment, the motor 104 is a permanent magnet motor designed to operate at speeds above the 3600 rpm maximum speed typically associated with synchronous motors powered by a 60 Hz power supply. Accordingly, electric motor 104 is often referred to as a "supersynchronous" motor. More specifically, in the illustrated embodiment, electric motor 104 includes a number of features that are advantageous over alternative drive mechanisms. For example, in the exemplary embodiment, the electric motor 104 can achieve speeds in the range of approximately 8,000 rpm to 20,000 rpm without employing additional components such as a gearbox to facilitate increased output speed. Alternatively, motor 104 speeds in excess of 20,000 rpm may be employed. The increased velocity facilitates rapid pressurization of the gas, thereby increasing the efficiency and effectiveness of the compression station 100 . Additionally, in this embodiment, the omission of additional components such as a gearbox results in the station 100 requiring a smaller footprint and associated maintenance. Another feature of this embodiment is the omission of wear parts such as carbon based slip rings. Thus, in the exemplary embodiment, the reliability of compression station 100 is facilitated along with electric motor 104 to be enhanced. Alternatively, motor 104 may be a permanent magnet synchronous motor, a separately excited motor, an induction motor, or any other drive means that achieves predetermined operating parameters and enables station 100 to function as described herein.

The compressor 102 is positioned and securely fixed within the compressor housing 103 . The electric motor 104 is positioned and secured within the pressure vessel 105 . In the exemplary embodiment, housing 103 and pressure vessel 105 are fabricated as separate components and joined together by methods known in the art. Alternatively, housing 103 and pressure vessel 105 may be manufactured as an integral (monolithic) element. Also, in the illustrated embodiment, housing 103 and pressure vessel 105 are made by a casting or forging process. Alternatively, housing 103 and pressure vessel 105 may be fabricated using any method known in the art, such as a welding process that enables housing 103 and pressure vessel 105 to be fabricated and assembled as described herein. Housing 103 includes a compressor suction mount 108 that is in fluid communication with an inlet line 110 . The tubing 110 may be made of metal, rubber, polyvinyl chloride (PVC), or any material that achieves predetermined operating parameters related to the conveyed fluid and the location of the station 100 .

In the exemplary embodiment, station 100 also includes a compressor end piece 112 coupled to and extending outwardly from housing 103 . End piece 112 facilitates encapsulation of compressor 102 within station 100 after compressor 102 is inserted into housing 103 and includes compressor discharge fixture 114 which connects to compressor outlet line 116 substantially similar to inlet line 110 fluid communication. In addition, the motor end cap assembly 118 is fixedly connected to the pressure vessel 105 . End cap 118 facilitates enclosing motor 104 within station 100 after motor 104 is inserted into pressure vessel 105 .

Electric motor 104 includes a rotor assembly 120 and a stator assembly 122 positioned such that a gap 124 is defined between stator assembly 122 and rotor assembly 120 . A plurality of power cables positioned within cable duct 126 facilitates connecting station 100 to a power source, such as a variable frequency drive (VFD) (not shown in FIG. 1 ). When the stator assembly 122 is energized, an electromagnetic field is induced within the motor 104 . Gap 124 facilitates magnetic coupling of rotor assembly 120 to stator assembly 122 to generate a torque that induces rotation in rotor assembly 120 .

Compressor 102 includes a rotatable drive shaft 128 rotatably coupled to rotor assembly 120 . In the illustrated embodiment, compressor 102 includes a plurality of compressor stages 130 . Alternatively, compressor 102 may include only one stage. The rotor assembly 120 and shaft 128 are rotatable about an axis of rotation 132 . System 100 also includes a motor-compressor housing seal 137 that facilitates reducing fluid communication between motor pressure vessel 125 and compressor housing 103 . The axis of rotation 132 may be in any orientation that facilitates obtaining predetermined operating parameters of the station 100, including but not limited to horizontal and vertical orientations.

During operation, the VFD supplies multi-phase alternating current to the stator assembly 122 at a predetermined voltage and frequency. A rotating electromagnetic field (not shown in FIG. 1 ) is generated in the stator assembly 122 . The second magnetic field is generated within rotor assembly 120 by methods including but not limited to permanent magnets and external excitation. Interaction of the rotor assembly 120 with the magnetic fields in the stator assembly 122 through the gap 124 induces torque and subsequently rotation of the rotor assembly 120 .

Station 100 receives natural gas through inlet line 110 at a first predetermined pressure. The gas is directed to the compressor 102 through the suction fixture 108 . The gas then flows into compressor 102 and is compressed to a greater density and a smaller volume at a second predetermined pressure greater than the first predetermined pressure. The compressed gas is discharged through discharge fixture 114 into outlet line 116 .

FIG. 2 is a schematic cross-sectional view of an illustrative motor 104 that may be used with fluid transfer station 100 . As noted above, electric motor 104 includes end cap assembly 118 , rotor assembly 120 , stator assembly 122 , gap 124 , cable duct 126 , shaft 132 , and seal 137 . The pressure vessel 105 encloses the electric motor 104 .

The rotor 120 includes a central portion 140 . The central portion may include, but is not limited to, a plurality of permanent magnets or a plurality of field windings (neither shown in FIG. 2 ) encapsulated around portion 140 . The rotor 120 also includes an outer main shaft portion 142 and an inner main shaft portion 143 . Likewise, sections 142 and 143 are connected to section 140 such that a rotational force induced within section 140 causes sections 142 and 143 and section 140 to rotate.

The electric motor 104 also includes an outboard bearing 146 and an inboard bearing 148 connected to the pressure vessel 105 . Bearings 146 and 148 facilitate radial positioning of rotor assembly 120 by rotor portions 142 and 143 . In the exemplary embodiment, bearings 146 and 148 are magnetic bearings 146 and 148 configured as active magnetic bearings. More specifically, a control subsystem (not shown in FIG. 2 ) is employed in conjunction with the magnetic bearings 146 and 148 to determine the relative weight of the rotating bearing component (not shown in FIG. 2 ) relative to the stationary component (not shown in FIG. 2 ) at any given moment. not shown in Figure 2) and facilitates magnetic adjustment to correct for any misalignment at any given angular position. Magnetic bearings 146 and 148 facilitate operation of rotor assembly 120 at the high speeds described above in relation to exemplary electric motor 104 . Alternatively, non-magnetic bearings including but not limited to eg radial bearings may be employed to achieve predetermined parameters including but not limited to reduced vibration and frictional losses. At least one worn out bearing (not shown in FIG. 2 ) may be positioned within electric motor 104 in a similar manner to bearings 146 and 148 to facilitate providing radial support to rotor assembly 120 should bearings 146 and/or 148 fail. Additionally, at least one thrust bearing (not shown in FIG. 2 ) may be positioned within motor 104 in a manner similar to bearings 146 and 148 to facilitate reducing rotor assembly 120 and shaft 128 (shown in FIG. 1 ). Axial thrust action.

In the illustrated embodiment, stator assembly 122 is at least partially enclosed within stator enclosure 150 . FIG. 3 is a skewed axial schematic illustration of a portion of an exemplary stator package 150 that may be used with electric motor 104 (shown in FIG. 2 ). The package 150 is described with reference to FIG. 3 in conjunction with FIG. 2 . For viewing purposes, FIG. 3 shows an axis of rotation 132 of rotor 104 .

Station 100 may be employed to deliver fluids having actively aggressive properties and/or impurities. These fluids may be introduced into pressure vessel 105 to lubricate and/or cool components of electric motor 104 . Encapsulation 150 facilitates isolating stator 122 from fluid circulating within pressure vessel 105 .

Encapsulation 150 includes a central portion 152 positioned radially within gap 124 . In the exemplary embodiment, central portion 152 is substantially cylindrical. Alternative embodiments are described below. Central portion 152 includes a radially inner surface 154 and a radially outer surface 156 . At least a portion of stator assembly 122 may contact outer surface 156 . The inner surface 154 and the outer perimeter of the rotor portion 140 define the annular gap 124 . Parameters related to the material used to make portion 152 include, but are not limited to, being non-conductive, magnetically neutral, and having sufficient strength and corrosion resistance to reduce deformation and corrosion of portion 152 during operation and may also include Features that facilitate heat transfer. Portion 152 may be made of materials including, but not limited to, alumina-based ceramic composites.

Inconel

和不锈钢的材料制成。The enclosure 150 may also include two flared portions, an outer flared portion 158 and an inner flared portion 160, which are connected to the cylindrical portion 152 and extend radially and axially therefrom. In an exemplary embodiment, portions 158 and 160 may be substantially conical. Portions 158 and 160 are positioned between magnetic bearings 146 and 148 , respectively, and at least a portion of stator assembly 122 . Portion 158 includes a radially inner surface 162 and a radially outer surface 164 . Portion 160 includes a radially inner surface 166 and a radially outer surface 168 . Parameters related to materials used to fabricate portions 158 and 160 include, but are not limited to, having sufficient strength and corrosion resistance to reduce deformation and corrosion of portions 158 and 160 during operation and may also include properties that facilitate heat transfer. Sections 158 and 160 may be made from including but not limited to Incoloy

Inconel

And made of stainless steel material.

In the exemplary embodiment, portions 152 and 158 are made of similar materials using methods including, but not limited to, welding or brazing portion 158 to portion 152 or casting portion 158 and portion 152 as an integral part (as shown in FIGS. 2 and 152 ). 3) to connect the two parts at their boundary. Subsequently, a portion 160 made of a different material than portion 158 and portion 152 is connected to portion 152 on the axially opposite side to portion 158 . A substantially annular seal 170 is secured at the interface of portion 152 and portion 160 to facilitate isolation of stator 122 from fluid conveyed within pressure vessel 105 . Seal 170 may be fabricated from a material having properties including, but not limited to, those that facilitate material and operational compatibility with the material properties of portions 152 and 160 and that facilitate achieving predetermined operating parameters associated with electric motor 104 .

Alternatively, portions 152 and 160 are made of similar materials, using methods that may include, but are not limited to, welding or brazing portion 160 to portion 152 or casting portion 160 and portion 152 as an integral part (in FIGS. 2 and 3 ). not shown) to connect the two parts at their boundary. Subsequently, a portion 158 made of a different material than the portions 160 and 152 is connected to the portion 152 on the side axially opposite to the portion 160 . A substantially annular seal (not shown in FIGS. 2 and 3 ), substantially similar to seal 170 , is secured at the interface of portions 158 and 152 to facilitate communication of stator 122 with fluid conveyed within pressure vessel 105 . separated.

Also, portions 158 and 160 may alternatively be made of a different material than portion 152 . In this alternative embodiment, a plurality of substantially annular seals 170 are secured at the interface of portions 152 and 160 and 152 and 158 . Also, alternatively, portions 152, 158 and 160 may be made of similar materials and joined at their boundaries using the methods described above.

In the exemplary embodiment, portion 152 is substantially cylindrical and portions 158 and 160 are substantially conical. Alternatively, portions 152, 158, and 160 may be any combination of geometries that facilitate obtaining predetermined operating parameters associated with motor 104 and station 100 (discussed further below).

4 is a skewed axial schematic illustration of an exemplary tooth portion 202 that may be used with the exemplary stator assembly 122 of the electric motor 104 (shown in FIG. 2 ). The package teeth 202 are described with reference to FIG. 4 in conjunction with FIG. 2 . For viewing purposes, FIG. 4 shows the axis of rotation 132 of the rotor 104 .

The stator assembly 122 includes a substantially cylindrical stator core 200 . Core 200 is positioned within at least a portion of stator assembly volume 172 defined by pressure vessel 105 and enclosure 150 (discussed further below). The core 200 includes a substantially cylindrical tooth portion 202 and a substantially cylindrical yoke portion 204 . Teeth section 202 includes a plurality of adjacent stator teeth 206 , wherein adjacent teeth 206 define a plurality of adjacent stator winding slots 208 .

Each tooth 206 is made by laminating a single lamination (not shown in FIGS. 2 and 4 ) by methods known in the art to form a tooth having predetermined axial and radial dimensions. The teeth 206 are circumferentially fixedly connected to the radially outer surface 156 of the tooth portion of the enclosure such that the winding slots 208 are formed with predetermined axial and radial dimensions. In the illustrated embodiment, the teeth 206 are positioned on the surface 156 via axial slots using a tongue and groove arrangement (not shown in FIGS. 2 and 4 ). Alternatively, teeth 206 are attached to surface 156 using methods that may include, but are not limited to, welding, brazing, and adhesives.

In the illustrated embodiment, enclosure central portion 152 is cylindrical. Alternatively, the package central part 152 may be formed to have a predetermined polygonal size. FIG. 5 is an axial schematic illustration of a portion of an alternative package tooth 252 that may be used with electric motor 104 (shown in FIG. 2 ). An alternative portion 252 is an extruded polygon including a plurality of extruded segments 253 . In this alternative embodiment, the extruded segments 253 are sized and positioned such that the segments 253 are substantially centered on the slots 208 and the number of segments 253 equals the number of slots 208 . Also, in this alternative embodiment, segment 253 and tooth 206 are sized and positioned such that the apex of extruded polygonal portion 252 is substantially centered on tooth 206 .

FIG. 6 is an axial schematic illustration of a portion of an alternative package tooth 352 that may be used with electric motor 104 (shown in FIG. 2 ). Alternative portion 352 is an extruded polygon comprising a plurality of extruded segments 353 . In this alternative embodiment, the extrusion segments 353 are sized and positioned such that the segments 353 are substantially centered on the teeth 206 and the number of segments 353 equals the number of slots 208 . Also, in this alternative embodiment, the size and location of segment 353 and slot 208 are designed such that the vertices of extruded polygonal portion 352 are substantially centered on slot 208 .

FIG. 7 is an axial schematic illustration of a portion of an alternative package tooth 452 that may be used with electric motor 104 (shown in FIG. 2 ). An alternative portion 452 is an extruded polygon including a plurality of extruded segments 453 . In this alternative embodiment, the extrusion segments 453 are sized and positioned such that a portion of the segments 453 are substantially centered on the teeth 206 and a portion of the segments 453 are substantially centered on the slots 208 in an alternating fashion. Also, in this alternative embodiment, the number of segments 453 is equal to the sum of the number of teeth 206 and the number of slots 208 .

FIG. 8 is an axial schematic illustration of a portion of an alternative package tooth 552 that may be used with electric motor 104 (shown in FIG. 2 ). Alternative geometry of portion 552 may be, but is not limited to, a right cylinder or an extruded polygon. In this alternative embodiment, portion 552 includes a plurality of slots 553 defined in radially outer surface 556 , wherein the number of slots 553 is equal to the number of teeth 208 . Slots 553 include predetermined axial and radial dimensions that facilitate receiving teeth 206 , thereby facilitating circumferential alignment of teeth 206 .

9 is a skewed axial schematic illustration of an illustrative yoke 204 of an illustrative stator core 200 that may be used in the illustrative stator assembly 122 of the electric motor 104 (shown in FIG. 2 ). The axis of rotation 132 of the rotor 104 is shown for viewing. The yoke 204 is described with reference to FIG. 9 in conjunction with FIG. 2 . In the illustrated embodiment, yoke portion 204 includes two substantially similar yoke segments 214 . Each yoke segment 214 includes a plurality of axial yoke mating surfaces 216 , a radially inner surface 218 , and a radially outer surface 220 . Yoke segment 214 is fabricated using methods, materials and equipment known in the art. Parameters related to the material used to make yoke segment 214 include, but are not limited to, having sufficient strength and corrosion resistance to reduce deformation and corrosion of yoke 204 during operation and may also include properties that facilitate heat transfer.

Yoke segments 214 are attached on mating surfaces 216 by press fit from an external enclosure such as pressure vessel 105 and secured using methods including, but not limited to, welding and brazing. The yoke 204 extends beyond the teeth 202 and is dimensioned such that at least a portion of the radially inner surface 218 of the yoke contacts at least a portion of the radially outer surface of the teeth 206 . The yoke 204 is also dimensioned such that at least a portion of the radially outer surface 220 of the yoke contacts the radially inner surface of the pressure vessel 105 (both not shown in FIG. 9 ). Also, the yoke 204 is sized to facilitate positioning within the stator chamber 172 (shown in FIG. 2 ).

10 is a schematic cross-sectional view of a plurality of thermally conductive laminations 232 and 234 that may be used in the exemplary stator assembly 122 of the electric motor 104 (shown in FIG. 2 ). The axis of rotation 132 of the rotor is shown for viewing. An exemplary stator stack is described with reference to FIG. 10 in conjunction with FIG. 2 . Specifically, tooth portion 202 includes a plurality of magnetic laminations 230 and a plurality of thermally conductive laminations 232 . More specifically, each tooth 206 (shown in FIG. 4 ) includes a plurality of magnetic laminations 230 and a plurality of thermally conductive laminations 232 . The magnetic stack 230 has a predetermined magnetic permeability so as to facilitate generation and conduction of magnetic flux within the core 200 . Thermally conductive lamination 232 has heat transfer characteristics that facilitate more efficient and significant heat dissipation from core 200 than lamination 230 . In the exemplary embodiment, thermally conductive stack 232 has a major constituent of copper or a copper alloy. Alternatively, stack 232 may include components in any amount and proportion that achieves predetermined parameters that facilitate operation of electric motor 104 .

In the exemplary embodiment, the yoke 204 is substantially similar to that described above. A plurality of thermally conductive laminations 234 substantially similar to laminations 232 in tooth portion 202 are interspersed within yoke portion 204 .

Base layers 232 and 230 are interspersed within teeth 202 and laminations 234 are interspersed within yoke 204 to achieve predetermined parameters for heat dissipation from core 200 and for magnetic connection of stator 122 to rotor 120 across gap 124 . In the exemplary embodiment, thermally conductive laminations 232 are interspersed within stator teeth 202 with a substantially equal axial length or axial pitch between each lamination 232 .

Also, in the exemplary embodiment, thermally conductive laminations 234 are interspersed in such a manner that each lamination 234 has a substantially equal axial length between them and has a radial dimension that facilitates thermal communication between laminations 232 and 234. inside the yoke 204 . Also, in the exemplary embodiment, laminations 232 and 234 within tooth portion 202 and yoke portion 204 , respectively, have substantially equal axial dimensions, ie, thicknesses. Furthermore, in the exemplary embodiment, the thickness of the laminations 232 is substantially uniform within the core 200, that is, a substantially uniform thickness distribution of the laminations 234 is obtained within the core 200, wherein each lamination 234 has a thickness basically equal. Alternatively, a distribution of different predetermined thicknesses of laminations 232 and 234 may be employed in order to obtain predetermined parameters that facilitate operation of motor 104 . Such alternative distributions may include uniform or non-uniform distributions of thickness variations.

11 is a schematic cross-sectional view of an alternative stator that may be used in electric motor 104 (shown in FIG. 2 ) having a plurality of thermally conductive laminations 332 and 334 that are thicker in yoke 304 than in teeth 302 . The axis of rotation 132 of the rotor is shown for viewing. The alternative stator core 300 includes an alternative tooth portion 302 and an alternative yoke portion 304 . Teeth 302 include the same plurality of magnetic laminations 330 and plurality of thermally conductive laminations 332 as similar components in the illustrative embodiment. Yoke 304 includes a plurality of thermally conductive laminations 334 that are substantially similar to laminations 234 (shown in FIG. ) is larger. In addition, the axial dimension (thickness) of the yoke lamination 334 is larger than the axial dimension (thickness) of the tooth lamination 332 . This alternative embodiment facilitates having a uniform temperature distribution within and heat dissipation from the yoke 304 . Also, in this alternative embodiment, laminations 332 and 334 within tooth portion 302 and yoke portion 304 respectively have substantially equal axial dimensions, ie thicknesses. Furthermore, in this alternative embodiment, the thickness of the laminations 332 is substantially uniform within the core 300, ie a substantially uniform thickness distribution of the laminations 332 is obtained within the core 300, wherein each lamination 332 The thickness is basically equal. Similarly, in the exemplary embodiment, the thickness of the stacks 334 is substantially uniform within the core 300, that is, a substantially uniform thickness distribution of the stacks 334 is obtained within the core 300, wherein each of the stacks 334 The thickness is basically equal. Alternatively, a distribution of different predetermined thicknesses of laminations 332 and 334 may be employed in order to obtain predetermined parameters that facilitate operation of electric motor 104 . Such alternative distributions may include uniform or non-uniform thickness variation distributions.

12 is a schematic cross-sectional view of an alternative stator that may be used in electric motor 104 (shown in FIG. 2 ) having a plurality of thermally conductive laminations 432 and 434 that are thicker in tooth portion 402 than in yoke portion 404 . The axis of rotation 132 of the rotor is shown for viewing. The alternative stator core 400 includes an alternative tooth portion 402 and an alternative yoke portion 404 . Tooth 402 includes a plurality of magnetic laminations 430 substantially similar to laminations 230 (shown in FIG. 10 ) in the exemplary embodiment, except that laminations 430 are configured to accommodate a plurality of alternative thermally conductive laminations 432 . Lamination 432 is substantially similar to lamination 232 (shown in FIG. 10 ), except lamination 432 has an axial dimension (ie, thickness) that is greater than the axial dimension (thickness) of lamination 232 . Yoke 404 includes a plurality of thermally conductive laminations 434 that are substantially similar to laminations 234 (shown in FIG. 10 ). In this alternative embodiment, the axial dimension (thickness) of the tooth lamination 432 is greater than the axial dimension (thickness) of the yoke lamination 434 . This alternative embodiment facilitates having a uniform temperature distribution within and dissipating heat from the teeth 402 . Also, in this alternative embodiment, laminations 432 and 434 within tooth portion 402 and yoke portion 404 respectively have substantially equal axial dimensions, ie thicknesses. Furthermore, in this alternative embodiment, the thickness of the laminates 432 is substantially uniform within the core 400, ie a substantially uniform thickness distribution of the laminates 432 is obtained within the core 400, wherein each laminate 432 The thickness is basically equal. Similarly, in the exemplary embodiment, the thickness of the stacks 434 is substantially uniform within the core 400, that is, a substantially uniform thickness distribution of the stacks 434 is obtained within the core 400, wherein each of the stacks 434 The thickness is basically equal. Alternatively, a distribution of different predetermined thicknesses of laminations 432 and 434 may be employed in order to obtain predetermined parameters that facilitate operation of electric motor 104 . Such alternative distributions may include uniform or non-uniform thickness variation distributions.

13 is a schematic cross-sectional view of a number of alternative thermally conductive stator laminations 532 and 534 having varying axial pitches that may be used with electric motor 104 (shown in FIG. 2 ). The axis of rotation 132 of the rotor is shown for viewing. The alternative stator core 500 includes an alternative tooth portion 502 and an alternative yoke portion 504 . Tooth 502 includes a plurality of magnetic laminations 530 substantially similar to laminations 230 (shown in FIG. 10 ) in the illustrative embodiment, except that laminations 530 are configured to accommodate alternative thermally conductive laminations 532 . Laminations 532 are substantially similar to laminations 232 (shown in FIG. 10 ), except that laminations 532 are interspersed within stator teeth 502 with varying axial lengths between each lamination 532 . Yoke 504 includes a plurality of thermally conductive laminations 534 that are substantially similar to laminations 234 (shown in FIG. 10 ), except that laminations 534 are interspersed within stator yoke 504 with variations between each lamination 534 axial length. The axial lengths between laminations 532 in tooth portion 502 and laminations 534 in yoke portion 504 are substantially equal to facilitate thermal communication between laminations 532 and 534 . This alternative embodiment facilitates having a uniform temperature distribution within and removing heat from the core 500 . Also, in this alternative embodiment, laminations 532 and 534 within tooth portion 502 and yoke portion 504 respectively have substantially equal axial dimensions, ie thicknesses. Furthermore, in this alternative embodiment, the thickness of the stacks 532 is substantially uniform within the core 500, ie a substantially uniform thickness distribution of the stacks 532 is obtained within the core 500, wherein each of the stacks 532 The thickness is basically equal. Similarly, in the exemplary embodiment, the thickness of the stacks 534 is substantially uniform within the core 500, that is, a substantially uniform thickness distribution of the stacks 534 is obtained within the core 500, wherein each of the stacks 534 The thickness is basically equal. Alternatively, a distribution of different predetermined thicknesses of laminations 532 and 534 may be employed in order to obtain predetermined parameters that facilitate operation of electric motor 104 . Such alternative distributions may include uniform or non-uniform thickness variation distributions.

Referring to FIG. 2 , the stator 122 also includes a plurality of armature windings, a plurality of end windings, or end turn portions 236 and 238 thereof being shown. Specifically, stator core 200 includes a plurality of outer and inner winding end turn portions 236 and 238 , respectively. In the exemplary embodiment, a plurality of end turn support elements 240 are secured to flared portion radially outer surfaces 164 and 168 to facilitate radial and axial support of winding end turn portions 236 and 238 . Alternatively, any number of elements 240 may be employed including, but not limited to, none. Element 240 may be formed of any material having characteristics including, but not limited to, those that facilitate forming material and operational compatibility with the material properties of surfaces 164 and 168 and winding end turn portions 236 and 238 and that facilitate obtaining predetermined operating parameters associated with motor 104 production.

14 is a schematic cross-sectional view of a plurality of exemplary armature slot outer and inner windings 242 and 244 , respectively, that may be used with the electric motor 104 . The rotor part 140 , the rotor axis of rotation 132 and the yoke 204 are shown for viewing. FIG. 15 is a skewed axial schematic view of the stator teeth 202 that may be used with the electric motor 104 in connection with the stator package center portion 152 (shown in FIG. 3 ). For viewing purposes, the rotor axis of rotation 132 and the flared encapsulation parts 158 and 160 are shown in FIG. 15 . Teeth 202 receive a plurality of armature slot outer and inner windings 242 and 244 within slots 208 , respectively. Winding 242 is positioned radially outward of slot 208 . Winding 244 is positioned radially inward of slot 208 . Winding end turn portions 236 and 238 are electrically connected to and extend axially outwardly from windings 242 and 244 and windings 242 and 244 and end turns 236 and 238 form a coil. In this configuration, the radial winding 244 of one coil is positioned radially inward of the radially outer winding 242 of the other coil within the slot 208 . Alternatively, any number and configuration of windings may be used. In the exemplary embodiment, windings 242 and 244 and end turn portions 236 and 238 are conductive rods fabricated using materials, equipment, and methods known in the art. Alternatively, windings 242 and 244 and end turn portions 236 and 238 may be, but are not limited to, conductive cables. Locating the windings 242 and 244 within the slot 208 prior to encapsulating the teeth 202 within the yoke 204 facilitates increasing the efficiency of the assembly and facilitating reducing possible deformation of the windings 242 and 244 .

FIG. 16 is a cross-sectional axial schematic illustration of a plurality of exemplary armature windings 242 and 244 that may be used with electric motor 104 (shown in FIG. 2 ). The rotor axis of rotation 132 and the encapsulation 152 are shown for viewing. Tooth 202 is shown with all windings 242 and 244 positioned within slot 208 between tooth 206 and end turn portions 236 (and 238 ) extending therefrom. Windings 242 and 244 and end turn portions 236 (and 238 ) are shown substantially transparent and package flare portions 158 (and 160 ) (shown in FIG. 15 ) are omitted for ease of viewing.

FIG. 17 is a cross-sectional axial schematic view of a plurality of yoke segments 214 connected to a plurality of armature windings 242 and 244 that may be used with the electric motor 104 (shown in FIG. 2 ). The rotor axis of rotation 132 and potting portion 152 are shown and potting flare portion 158 (and 160 ) are omitted for viewing (shown in FIG. 15 ). Tooth 202 is shown with all windings 242 and 244 positioned within slot 208 between tooth 206 and end turn portions 236 (and 238 ) extending therefrom. Teeth 202 are also shown positioned within first yoke segment 214 . End turn portions 236 (and 238 ) extend axially and flare radially outward from tooth portion 202 and are shown partially obscuring lower yoke segment 214 . In the exemplary embodiment, upper yoke segment 214 is positioned over teeth 202 and windings 242 and 244 and is connected to lower yoke segment 214 at mating surface 216 as described above. Also, assembling yoke 204 in this manner facilitates reducing interference or deformation of armature windings 242 and 244 and end turn portions 236 and 238 .

FIG. 18 is a skewed axial schematic view of an exemplary pressure vessel 105 that may be used with the electric motor 104 (shown in FIG. 2 ). The axis of rotation 132 of the rotor is shown for viewing. The pressure vessel 105 is described with reference to FIG. 18 in conjunction with FIG. 2 . The pressure vessel 105 includes a substantially cylindrical radially outer surface 246 , a radially inner surface 248 , and a plurality of outer fins 250 . The fins 250 are fixedly connected to the outer surface 246 . Pressure vessel 105 also includes a plurality of substantially annular end walls 251 positioned at axially opposite ends of pressure vessel 105 extending radially inward from inner surface 248 .

和不锈钢。In the exemplary embodiment, the fins 250 and at least one end wall 251 are integrally formed with the pressure vessel 105 by methods including, but not limited to, forging and casting. Alternatively, fins 250 and end wall 251 may be fabricated separately and attached to the outer surface 246 and inner surface of the pressure vessel, respectively, by methods including, but not limited to, welding and brazing. The fins 250 include predetermined axial and radial dimensions to facilitate heat transfer from the electric motor 104 . End wall 251 includes predetermined radial dimensions that facilitate defining annular passage 254 . Opening 254 is sized to accommodate rotor shaft portion 142 and seal 137 . Parameters related to the material used to fabricate the pressure vessel 105 include, but are not limited to, having sufficient thermal conductivity properties to facilitate heat transfer, and having sufficient strength and corrosion resistance to reduce deformation and corrosion of the pressure vessel 105 during operation . Materials that can be used to make pressure vessel 105 include, but are not limited to, Incoloy Inconel

and stainless steel.

In the exemplary embodiment, pressure vessel 105 is substantially cylindrical. Alternatively, pressure vessel 105 and its associated components may have any shape and/or configuration subject to predetermined operating parameters. Also, in the exemplary embodiment, the radial distance between surfaces 246 and 248 , i.e., the thickness of pressure vessel 105 and the material from which pressure vessel 105 is fabricated, is sufficient to favorably withstand operating parameters such as, but not limited to, the depth of water associated with immersion station 100 The external operating pressure and temperature associated with the body of water and the properties of the fluid being conveyed.

FIG. 19 is an axial schematic view of an exemplary pressure vessel 105 that may be used with the electric motor 104 . The enclosure central portion 152, the teeth 202 and the yoke 204 are shown and the wall 251 is omitted for clarity of view. The pressure vessel 105 is further described with reference to FIGS. 19 and 2 together. In the exemplary embodiment, pressure vessel inner surface 248 is connected in thermal communication with yoke outer surface 220 to facilitate heat transfer from yoke 204 to pressure vessel 105 . Methods of joining surface 248 to surface 220 may include, but are not limited to, a pressurized tight fit including, but not limited to, a shrink fit and/or a hydraulic shrink fit to obtain a preloaded, low tolerance fit. To further join surface 248 to surface 220, the seam defined at the mating area of surface 248 and surface 220 may be sealed by methods including, but not limited to, welding, brazing, adhesive bonding, and sintering. The tight fit of pressure vessel 105 and yoke 204 facilitates securing tooth 202 between yoke 204 and enclosure 150 .

Referring to FIG. 2 , a portion of each end wall 251 adjoins the axially outermost portions of the enclosure flared portions 158 and 160 to form a substantially annular stator chamber 172 . The chamber 172 substantially separates the stator core 200 from the conveying fluid. The chamber 172 may further be described as a plurality of sections. A substantially annular central portion 260 of the chamber 172 is defined between the radially outer surface 156 of the enclosure central portion and a portion of the pressure vessel radially inner surface 248 and encloses the stator core 200 . Outboard end turn portion 262 is defined between a portion of central portion radially outer surface 156 , flared portion radially outer surface 164 , end wall 252 , a portion of pressure vessel radially inner surface 248 , and the axially outer surface of core 200 . Portion 262 encapsulates stator end turn portion 236 . Inboard end turn portion 264 is defined between a portion of central portion radially outer surface 156 , flared portion radially outer surface 168 , end wall 252 , a portion of pressure vessel radially inner surface 248 , and the axially inner surface of core 200 . Portion 264 encapsulates stator end turn portion 238 .

In the exemplary embodiment, chamber 200 is filled with a dielectric fluid, such as, but not limited to, transformer oil. The dielectric fluid has properties including, but not limited to, facilitating heat convection and heat conduction and reducing arcing that may occur within the chamber 200 .

Referring to FIGS. 1 and 2 , in operation, fluid delivered by compressor 102 (shown in FIG. 1 ) may also be used to facilitate cooling of electric motor 104 . Before power is supplied to stator 122 and motor 104 is started, volume 106 within pressure vessel 105 excluding stator chamber 172 but including the volume defined by motor end cap assembly 118 and end wall 252 is charged at a predetermined boost rate. The fluid is delivered and a predetermined pressure is obtained, including but not limited to a pressure substantially similar to that of the inlet line 110 . As the pressure of vessel 106 varies, the pressure of stator enclosure 172 may likewise be varied using methods and apparatus known in the art in order to reduce the pressure differential between volume 105 and stator chamber 172 .

Once the motor 104 is energized and the rotor 120 is spinning, heat losses from the conveying fluid and fluid friction losses can increase the temperature of the rotor portion 140 . Conveying fluid flow and heat transfer to rotor assembly 120, particularly section 140, facilitates heat transfer from rotor section 140 to other components including, but not limited to, motor end cap assembly 118 and enclosure sections 152, 158, and 160 for subsequent heat transfer, respectively. to the external environment and the dielectric fluid within chamber 172.

Also, during operation of the motor 104, the stator 122 is powered, and heat losses within the stator end turn portions 236 and 238 generally increase the temperature of the associated components. Heat losses within portions 236 and 238 are substantially conducted to the dielectric fluid. Convective fluid flow within chamber portions 262 and 264 is induced by a temperature difference between the dielectric fluid in contact with stator end turn portions 236 and 238 and the dielectric fluid in contact with different portions 236 and 238 . The heat is then transferred to the pressure vessel 105 .

Furthermore, during operation of the motor 104, the stator 122 is powered, and the heat losses generated within the stator teeth 202 through the armature windings 242 and 244 (shown in FIG. 14 ) are substantially is collected and directed to pressure vessel 105.

As noted above, during operation, the pressure vessel 105 is configured to receive a predetermined amount of heat from the components of the electric motor 104 at a predetermined heat transfer rate. The environment surrounding the pressure vessel 105 typically has a lower temperature than the environment within the pressure vessel 105 . Thus, surface 246 and fins 250 are generally cooler than surface 248 and facilitate heat transfer from electric motor 104 to the environment outside of pressure vessel 105 .

The compression stations described herein facilitate the transportation of natural gas by pipeline. More specifically, the compressor station assembly includes a compressor coupled to a supersynchronous motor. Supersynchronous motors facilitate the elimination of additional components such as gearboxes, thereby facilitating a smaller footprint of the station and the associated gearbox maintenance costs. Such motors also facilitate operation at higher energy densities and higher speeds, thereby further reducing footprint, and are more efficient due to the ability to operate at higher speeds. Thus, the operational efficiency of the compression station can be increased and the capital and maintenance costs of the station can be reduced.

The methods and apparatus described herein for transferring fluids in pipelines facilitate the operation of fluid transfer stations. More specifically, an electric motor as described above facilitates the construction of a more robust fluid transfer station. This electric motor configuration also facilitates increased efficiency, reliability, and reduced maintenance costs and losses at the fluid transfer station.

Illustrative embodiments of electric motors associated with fluid transfer stations are described above in detail. The methods, apparatus, and systems are not limited to the specific embodiments described herein, nor to the specific illustrated motors and fluid delivery stations.

While the invention has been described in terms of specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

parts list

101 compression station 102 compressor 103 shell 104 electric motor 105 pressure vessel 106 Volume 108 compressor suction mount

110 Inlet pipeline 112 Compressor end parts 114 compressor discharge mount 116 Compressor outlet piping 118 End cap assembly 120 Rotor assembly 122 Stator assembly 124 clearance 126 cable duct 128 rotatable drive shaft 130 compressor stage 132 Axis of rotation 137 housing seal 140 Rotor part 142 Outer spindle part 143 Inner shaft part 146 Magnetic bearing 148 inner bearing 150 Stator package 152 central part 154 The inner surface 156 The outer surface 158 flared part 160 Inner flaring part 162 The inner surface 164 The outer surface 166 The inner surface 168 The outer surface 170 Seals 172 Stator chamber 200 Stator core part

202 Teeth 204 Yoke 206 stator teeth 208 groove 214 Yoke segment 216 mating surface 218 The inner surface 220 The outer surface 230 Magnetic stack 232 Conductive stack 234 Conductive stack 236 End turn part 238 End turn part 240 component 242 armature winding 244 armature winding 246 The outer surface 248 The inner surface 250 external fins 251 end wall 252 end wall 253 extrusion section 254 opening 260 central part 262 Outer end turn part 264 Inner end turn part 300 Core 302 Teeth 304 Yoke 330 Magnetic stack 332 Conductive stack

334 Conductive stack 352 Teeth 353 extrusion section 400 Core 402 Teeth 404 Yoke 430 Magnetic stack 432 Conductive stack 434 Conductive stack 452 Teeth 453 extrusion section 500 Core 502 Yoke 530 Magnetic stack 532 Conductive stack 534 Conductive stack 552 Teeth 553 groove 556 The outer surface

Claims (6)

1. stator module (122) that is used for motor (104), described stator module comprises:

Pressure vessel (105);

With described pressure vessel thermal communication so that the yoke that from described stator module, dispels the heat (204);

Comprise a plurality of laminations (232,234) a plurality of teeth (206), described a plurality of lamination comprises that the first lamination that at least one has the first thermal conductivity and the first permeability and at least one have the second lamination of the second thermal conductivity and the second permeability, wherein the first thermal conductivity is different from the second thermal conductivity and the first permeability is different from the second permeability, described the second lamination is included in the first of radially extending with the first predetermined axial width in described a plurality of tooth and the second portion that radially extends with the second predetermined axial width in described yoke, described second portion and described pressure vessel thermal communication are so that dispel the heat from described stator module.

2. stator module (122) as claimed in claim 1 is characterized in that, the described first predetermined axial width equals the described second predetermined axial width substantially.

3. stator module (122) as claimed in claim 1 is characterized in that, the described first predetermined axial width is greater than the described second predetermined axial width.

4. stator module (122) as claimed in claim 1 is characterized in that, the described second predetermined axial width is greater than the described first predetermined axial width.

5. stator module (122) as claimed in claim 1 is characterized in that, described second is stacked in described yoke and described a plurality of tooth inner clip is set to and has predetermined basic evenly axial pitch.

6. stator module (122) as claimed in claim 1 is characterized in that, described second is stacked in described yoke and described a plurality of tooth inner clip is set to and has predetermined non-homogeneous axial pitch.

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